You'll most likely just have to email Ebaybanned a picture of the broken buckle and they will probably send you another belt.
That is what they usually do/ask me when they send me something wrong or broken.
And usually they don't even ask you to return the broken one.

__________________"Certainly there is no hunting like the hunting of man, and those who have hunted armed men long enough and like it, never really care for anything else thereafter."
- Ernest Hemingway